Consumers Energy Company Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Other Paid-in Capital	Accumulated Other Comprehensive Loss	Retirement benefits liability	Retained Earnings	Cumulative Preferred Stock	Consumers Energy Company	Consumers Energy Company Common Stock	Consumers Energy Company Other Paid-in Capital	Consumers Energy Company Accumulated Other Comprehensive Loss	Consumers Energy Company Retirement benefits liability	Consumers Energy Company Retained Earnings	Consumers Energy Company Cumulative Preferred Stock
Total Equity at Beginning of Period at Dec. 31, 2021	$ 7,188	$ 3	$ 5,406	$ (59)	$ (56)	$ 1,057		$ 9,279	$ 841	$ 6,599		$ (32)	$ 1,834	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										685
Amortization of net actuarial loss	2				2			1				1
Net Income	501							556					556
Dividends declared on common stock						(267)							(433)
Dividends declared on preferred stock						(5)							(1)
Total Equity at End of Period at Jun. 30, 2022	7,471	3	5,417	(52)	(52)	1,286	$ 224	10,087	841	7,284	$ (31)		1,956	37
Total Equity at Beginning of Period at Mar. 31, 2022	7,405	3	5,406	(54)	(53)	1,275		9,838	841	7,049		(31)	1,942	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										235
Amortization of net actuarial loss	1				1			0				0
Net Income	148							173					173
Dividends declared on common stock						(134)							(158)
Dividends declared on preferred stock						(3)							(1)
Total Equity at End of Period at Jun. 30, 2022	7,471	3	5,417	(52)	(52)	1,286	224	10,087	841	7,284	(31)		1,956	37
Total Equity at Beginning of Period at Dec. 31, 2022	7,595	3	5,490	(52)	(52)	1,350		10,155	841	7,284		(15)	2,008	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										475
Amortization of net actuarial loss	1				1			0				0
Net Income	402							399					399
Dividends declared on common stock						(284)							(305)
Dividends declared on preferred stock						(5)							(1)
Total Equity at End of Period at Jun. 30, 2023	7,706	3	5,506	(51)	(51)	1,463	224	10,723	841	7,759	(15)		2,101	37
Total Equity at Beginning of Period at Mar. 31, 2023	7,652	3	5,494	(51)	(51)	1,410		10,175	841	7,359		(15)	1,953	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										400
Amortization of net actuarial loss	1				1			0				$ 0
Net Income	198							167					167
Dividends declared on common stock						(142)							(18)
Dividends declared on preferred stock						(3)							(1)
Total Equity at End of Period at Jun. 30, 2023	$ 7,706	$ 3	$ 5,506	$ (51)	$ (51)	$ 1,463	$ 224	$ 10,723	$ 841	$ 7,759	$ (15)		$ 2,101	$ 37